llvm/test/CodeGen/Hexagon/rdf-copy-clobber.mir

# RUN: llc -march=hexagon -run-pass=hexagon-rdf-opt -hexagon-rdf-dump -verify-machineinstrs -o /dev/null %s 2>&1 | FileCheck %s

# Check that RDF graph has a phi node for R28 register in bb.3 and bb.4
# R28 is clobbered by memcpy call. The clobbering def must be present in bb.4's IDF
# This phi node should prevent $r27 from being replaced by $r28 by RDF copy propagation

#CHECK-LABEL: Starting copy propagation on: foo

#CHECK-LABEL: --- %bb.3 ---
#CHECK: p{{[0-9]+}}: phi [+d{{[0-9]+}}<R28>

#CHECK-LABEL: --- %bb.4 ---
#CHECK: p{{[0-9]+}}: phi [+d{{[0-9]+}}<R28>

#CHECK-LABEL: After Hexagon RDF optimizations
#CHECK-LABEL: bb.3:
#CHECK: renamable $r0 = A2_add renamable $r27

--- |
  define internal fastcc void @foo() unnamed_addr {
  entry:
    ret void
  }

  declare void @llvm.memcpy.p0.p0.i32(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i32, i1 immarg)

---
name:            foo
alignment:       16
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
callsEHReturn:   false
callsUnwindInit: false
hasEHContTarget: false
hasEHScopes:     false
hasEHFunclets:   false
isOutlined:      false
debugInstrRef:   false
failsVerification: false
tracksDebugUserValues: true
registers:       []
liveins:
  - { reg: '$d0', virtual-reg: '' }
  - { reg: '$d3', virtual-reg: '' }
  - { reg: '$r23', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 4294967295
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  isCalleeSavedInfoValid: false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:
  - { id: 0, type: default, offset: 40, size: 8, alignment: 8, stack-id: default,
      isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
stack:
  - { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 1, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 2, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 3, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
entry_values:    []
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  bb.0.entry:
    successors: %bb.1
    liveins: $d0, $d3, $r23

    J2_jump %bb.1, implicit-def dead $pc

  bb.1:
    successors: %bb.2
    liveins: $d0:0x0000000000000003, $d3:0x0000000000000003, $r23

    renamable $r28 = L2_loadri_io %fixed-stack.0, 0 :: (load (s32) from %fixed-stack.0)
    renamable $r27 = COPY killed renamable $r28

  bb.2:
    successors: %bb.3
    liveins: $d0:0x0000000000000003, $d3:0x0000000000000003, $r23, $r27

    renamable $d10 = L2_loadrd_io %stack.0, 0 :: (load (s64) from %stack.0)
    renamable $d11 = L2_loadrd_io %stack.1, 0 :: (load (s64) from %stack.1)

  bb.3:
    successors: %bb.4, %bb.3
    liveins: $d0:0x0000000000000003, $d3:0x0000000000000003, $d10:0x0000000000000003, $d11:0x0000000000000002, $r23, $r27

    ADJCALLSTACKDOWN 0, 0, implicit-def $r29, implicit-def dead $r30, implicit $r31, implicit $r30, implicit $r29
    renamable $r1 = A2_add renamable $r23, killed renamable $r0
    $r2 = COPY renamable $r22
    renamable $r0 = A2_add renamable $r27, killed renamable $r6
    J2_call &memcpy, hexagoncsr, implicit-def dead $pc, implicit-def dead $r31, implicit $r29, implicit $r0, implicit $r1, implicit $r2, implicit-def $r29, implicit-def dead $r0
    renamable $p0 = C2_cmpgtp renamable $d11, renamable $d10
    ADJCALLSTACKUP 0, 0, implicit-def dead $r29, implicit-def dead $r30, implicit-def dead $r31, implicit $r29
    J2_jumpt killed renamable $p0, %bb.3, implicit-def dead $pc
    J2_jump %bb.4, implicit-def dead $pc

  bb.4:
    successors: %bb.5, %bb.2
    liveins: $d10:0x0000000000000003, $d11:0x0000000000000002, $r23, $r27

    renamable $d0 = L2_loadrd_io %stack.2, 0 :: (load (s64) from %stack.2)
    renamable $d3 = L2_loadrd_io %stack.3, 0 :: (load (s64) from %stack.3)
    renamable $p0 = C2_cmpgtp killed renamable $d0, killed renamable $d3
    J2_jumpt killed renamable $p0, %bb.2, implicit-def dead $pc
    J2_jump %bb.5, implicit-def dead $pc

  bb.5:
    PS_jmpret $r31, implicit-def dead $pc

...